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The problem might be that there is dirt blocking the idle jet. This jet is located on the right had side of the carburetor. the brass nut that you would see when looking at the carburetor on the right hand side would be the idle jet. you can unscrew it by using a 8mm spanner and clean it by blowing the dirt out.
This should rectify the problem but should you need more information do not hesitate to ask.